<?php //$Id: backup.php,v 1.46.2.1 2008/03/08 15:36:00 skodak Exp $
	//This script is used to configure and execute the backup proccess.

	//Define some globals for all the script

	require_once ("../config.php");
	require_once ("lib.php");
	require_once ("backuplib.php");
	require_once ("$CFG->libdir/blocklib.php");
	require_once ("$CFG->libdir/adminlib.php");

	$id = optional_param( 'id' );	   // course id
	$to = optional_param( 'to' ); // id of course to import into afterwards.
	$cancel = optional_param( 'cancel' );
	$launch = optional_param( 'launch' );


	if (!empty($id)) {
		require_login($id);
		if (!has_capability('moodle/site:backup', get_context_instance(CONTEXT_COURSE, $id))) {
			error("You need to be a teacher or admin user to use this page.", "$CFG->wwwroot/login/index.php");
		}
	} else {
		require_login();
		if (!has_capability('moodle/site:backup', get_context_instance(CONTEXT_SYSTEM))) {
			error("You need to be an admin user to use this page.", "$CFG->wwwroot/login/index.php");
		}
	}

	if (!empty($to)) {
		if (!has_capability('moodle/site:backup', get_context_instance(CONTEXT_COURSE, $to))) {
			error("You need to be a teacher or admin user to use this page.", "$CFG->wwwroot/login/index.php");
		}
	}

	//Check site
	if (!$site = get_site()) {
		error("Site not found!");
	}

	//Check necessary functions exists. Thanks to gregb@crowncollege.edu
	backup_required_functions();

	//Check backup_version
	if ($id) {
		$linkto = "backup.php?id=".$id.((!empty($to)) ? '&to='.$to : '');
	} else {
		$linkto = "backup.php";
	}
	upgrade_backup_db($linkto);

	//Get strings
	if (empty($to)) {
		$strcoursebackup = get_string("coursebackup");
	}
	else {
		$strcoursebackup = get_string('importdata');
	}
	$stradministration = get_string("administration");

	//If cancel has been selected, go back to course main page (bug 2817)
	if ($cancel) {
		if ($id) {
			$redirecto = $CFG->wwwroot . '/course/view.php?id=' . $id; //Course page
		} else {
			$redirecto = $CFG->wwwroot.'/';
		}
		redirect ($redirecto, get_string('backupcancelled')); //Site page
		exit;
	}

	//If no course has been selected, show a list of available courses

	$navlinks = array();
	if (!$id) {
		$navlinks[] = array('name' => $stradministration, 'link' => "$CFG->wwwroot/$CFG->admin/index.php", 'type' => 'misc');
		$navlinks[] = array('name' => $strcoursebackup, 'link' => null, 'type' => 'misc');
		$navigation = build_navigation($navlinks);

		print_header("$site->shortname: $strcoursebackup", $site->fullname, $navigation);

		if ($courses = get_courses('all','c.shortname','c.id,c.shortname,c.fullname')) {
			print_heading(get_string("choosecourse"));
			print_simple_box_start("center");
			foreach ($courses as $course) {
				echo '<a href="backup.php?id='.$course->id.'">'.format_string($course->fullname).' ('.format_string($course->shortname).')</a><br />'."\n";
			}
			print_simple_box_end();
		} else {
			print_heading(get_string("nocoursesyet"));
			print_continue("$CFG->wwwroot/$CFG->admin/index.php");
		}
		print_footer();
		exit;
	}

	//Get and check course
	if (! $course = get_record("course", "id", $id)) {
		error("Course ID was incorrect (can't find it)");
	}

	//Print header
	if (has_capability('moodle/site:backup', get_context_instance(CONTEXT_SYSTEM))) {
		$navlinks[] = array('name' => $stradministration, 'link' => "$CFG->wwwroot/$CFG->admin/index.php", 'type' => 'misc');
		$navlinks[] = array('name' => $strcoursebackup, 'link' => 'backup.php', 'type' => 'misc');
		$navlinks[] = array('name' => "$course->fullname ($course->shortname)", 'link' => null, 'type' => 'misc');
		$navigation = build_navigation($navlinks);

		print_header("$site->shortname: $strcoursebackup", $site->fullname, $navigation);
	} else {
		$navlinks[] = array('name' => $course->fullname, 'link' => "$CFG->wwwroot/course/view.php?id=$course->id", 'type' => 'misc');
		$navlinks[] = array('name' => $strcoursebackup, 'link' => null, 'type' => 'misc');
		$navigation = build_navigation($navlinks);
		print_header("$course->shortname: $strcoursebackup", $course->fullname, $navigation);
	}

	//Print form
	print_heading(format_string("$strcoursebackup: $course->fullname ($course->shortname)"));
	print_simple_box_start("center");

	//Adjust some php variables to the execution of this script
	@ini_set("max_execution_time","3000");
	raise_memory_limit("192M");

	//Call the form, depending the step we are
	if (!$launch) {
		// if we're at the start, clear the cache of prefs
		if (isset($SESSION->backupprefs[$course->id])) {
			unset($SESSION->backupprefs[$course->id]);
		}
		include_once("backup_form.html");
	} else if ($launch == "check") {
		include_once("backup_check.html");
	} else if ($launch == "execute") {
		include_once("backup_execute.html");
	}
	print_simple_box_end();

	//Print footer
	print_footer();
?>
